Error on Viewing a Popup Link

Here is my problem.

When I double-click a popup link, I sometimes get an error message as shown below:

An error has occurred in the script on this page
Line XXXX
Char 2
Error Access is denied
Code 0
URL: XXXXXXX
Do you want to continue running scrips on this page? Yes or No

This error happens randomly on a popup link when I'm viewing the page or after I generated the chm file. If I click the link several times, eventually the link works. However, next time I click the same link, it may or may not work.

Also, if I single-click a link, the link works fine without failure. I checked the same link that was created in RoboHelp X5, and it works just fine. It appears that it’s a bug in RoboHelp 7, but I don't know how to fix it.

If you know how to fix this, please let me know.

Thanks.